EP0664217A1 - Harzfilter für einen tintenstrahldruckkopf und verfahren zu deren herstellung - Google Patents

Harzfilter für einen tintenstrahldruckkopf und verfahren zu deren herstellung Download PDF

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Publication number
EP0664217A1
EP0664217A1 EP94919883A EP94919883A EP0664217A1 EP 0664217 A1 EP0664217 A1 EP 0664217A1 EP 94919883 A EP94919883 A EP 94919883A EP 94919883 A EP94919883 A EP 94919883A EP 0664217 A1 EP0664217 A1 EP 0664217A1
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EP
European Patent Office
Prior art keywords
ink
ink jet
filter
jet head
resin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94919883A
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English (en)
French (fr)
Other versions
EP0664217A4 (de
EP0664217B1 (de
Inventor
Akira C/O Canon Kabushiki Kaisha Goto
Toshiaki C/O Canon Kabushiki Kaisha Sasaki
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Canon Inc
Original Assignee
Canon Inc
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Publication date
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Publication of EP0664217A1 publication Critical patent/EP0664217A1/de
Publication of EP0664217A4 publication Critical patent/EP0664217A4/de
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Publication of EP0664217B1 publication Critical patent/EP0664217B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B41J2/17503—Ink cartridges
    • B41J2/1752—Mounting within the printer
    • B41J2/17523—Ink connection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B41J2/17563—Ink filters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
    • Y10S264/48—Processes of making filters

Definitions

  • the present invention relates to a filter made of a resin which is suitable for use in an ink jet apparatus of printing image information on a recording medium by flying ink droplets to said recording medium and to a process for the production of said filter.
  • the ink jet printing system is to discharge ink through a minute nozzle whereby printing a character or image on a printing medium such as paper, cloth, plastic sheet, or the like.
  • a printing medium such as paper, cloth, plastic sheet, or the like.
  • various ink jet apparatus having an ink jet head of such ink jet printing system.
  • These ink jet apparatus have been often used as printers serving as power outputting terminals in copying machines, facsimile machines, word processors, or work stations, or as printers of the handy type or potable type installed in information processing systems such as personal computers, host computers, optical disk apparatus, and video apparatus.
  • the ink jet head employed in the ink jet printing system generally comprises a discharging outlet for discharging ink, a liquid chamber for storing ink to be supplied to the discharging outlet, an ink pathway of communicating the discharging outlet with the liquid chamber, an energy generating element which is disposed in a given portion of the ink pathway and which serves to generate an energy for discharging ink through the discharging outlet, and an ink supply port for supplying ink into the liquid chamber from the outside of the ink jet head.
  • the ink to be supplied to the ink jet head is supplied from an ink container through an ink supplying means.
  • a filter for ink is usually disposed between the ink supplying means and the ink supply port or between the ink supplying means and the ink container. The ink to be supplied to the ink jet head through the ink container is flown into the discharging nozzle through the filter.
  • the filter used herein is required to achieve the following roles: (1) to prevent the nozzle from being clogged with contaminants such as dusts, small ink masses, or the like contained in the ink whereby preventing occurrence of non-discharging or a variation in the ink discharging direction, and (2) to prevent air from entering into the liquid chamber whereby preventing occurrence of instable ink discharging due to a decrease in the discharging energy.
  • the filter As for the position for the filter to be disposed in an ink jet head, it is desired to be as close as possible to the nozzle (the discharging outlet). The reason for this is that in the case where the filter is disposed in an upstream portion of the ink supply system, although ink in the ink container can be filtrated, there is a fear for the ink to be contaminated with air during its movement until the nozzle (the discharging outlet).
  • the filter itself, it is desired to be as smaller as possible in terms of fluid resistance for the reason that especially in the case of driving an ink jet head a high speed, the ink refilling rate is decreased as the fluid resistance increases, resulting in imparting a negative influence to the high speed driving.
  • the filter in the conventional ink jet apparatus is constituted by ceramic, capillaries, fiber, plastic, or sintered body.
  • the filter constituted by any of said materials as it is difficult to be disposed at a complicated portion in the inside of the ink jet head, it is usually disposed at a given installation portion which has been intentionally established therefor.
  • Such installation portion is established typically at a contact portion between the top plate and the ink supply pipe or a tip portion of the ink supply pipe, respectively of the ink jet head.
  • the area of the installation portion for the filter it is unavoidably governed by the size of the ink supply port in the ink jet head. Accordingly, there is a limit for the area of the installation portion for the filter.
  • the filter is necessary to be designed such that it achieve the above described roles within a limited, narrow area.
  • the installation portion for the filter be designed to be in a desired form so that the welding can be readily conducted, and in addition to this, there is a restriction for the kind of a material as the installation portion at which the filter is to be installed.
  • the present invention has been accomplished in view of the foregoing subjects found in the prior art. Particularly, the present inventors made extensive studies in order to solve the foregoing problems and as a result, obtained a new filter which has been never known before.
  • the present invention makes it an principal object to provide a filter which can be precisely formed integrally with a constituent member of a structural body selected from devices having a complicated structure and devices having a fine structure.
  • the present invention is to provide a filter usable for the filtration of a liquid, characterized by comprising a number of pores formed in a hardened resin layer, said pores being communicated with each other so that said liquid can pass through said resin layer.
  • Said pores are formed on the basis of microballoons each comprising a core composed of a material capable of expanding and vaporizing at a temperature which is higher than room temperature, said core being contained in a shell composed of a thermosetting resin as a main component.
  • the present invention also provides a process for producing the above filter.
  • the process for producing the above filter comprises the steps of dispersing a number of microballoons each having a shell constituted by a solvent-soluble resin in an activation energy setting resin to obtain a dispersion, subjecting said dispersion to heat treatment to expand each of the microballoons and hardening the activation energy setting resin, treating the resultant with a solvent having a selective solubility to only the shell of each of the microballoons to remove all the shells of the microballoons whereby pores formed on the basis of the microballoons are communicated with each other to provide a filter.
  • the present invention makes it possible to easily form a desired filter having a desired form in a given place dedicated for a filter to be disposed therein (the given place herein may be a complicated place or a small place) at a high precision by applying the foregoing resin dispersion containing microbaloons in said given place by means of a coating technique such as a screen printing process, hardening the resin dispersion applied, and subjecting the resultant to etching treatment using a solvent having a selective solubility to the resin.
  • the filter thus formed sufficiently exhibit the functions required for a filter.
  • the filter formed may be controlled to have an appropriate fluid resistant by properly adjusting the size of the pore (or the hollow) of each of the microballoons as desired.
  • the filter thus obtained makes it possible to remove foreign matters such as dusts without raising its fluid resistance.
  • the foregoing activation energy ray-setting resin used in the above serves as a binder resin and has an adhesion property.
  • the filter can be properly disposed in a desired place without using an adhesive.
  • the present invention includes an improved ink jet head provided with a filter in which a number of pores are formed in a hardened resin layer, said pores being communicated with each other so that liquid can pass through the resin layer, and a process for producing said ink jet head.
  • the improved ink jet head comprises an ink discharging outlet; a substrate for said ink jet head including an electrothermal converting body comprising a heat generating resistor for generating thermal energy for discharging ink from said discharging outlet, and wirings electrically connected to said heat generating resistor so that said wirings can supply an electric signal for generating said thermal energy to said heat generating resistor; and an ink supply system for supplying ink, characterized in that a filter is disposed in a part of the ink supply system, said filter comprising a number of pores formed in a hardened resin layer, said pores being communicated with each other so that ink can pass through the resin layer.
  • the process for producing an ink jet head according to the present invention comprises the steps of:
  • a high quality ink jet head can be produced at a good yield and a good productivity, with a high precision, and at a relatively low production cost.
  • the present invention is applicable to not only a black monochromic ink jet head but also to a multicolor ink jet head having a complicated configuration, a serial scanning type ink jet head, and a full-line type ink jet head.
  • the multicolor ink jet head and full-line type ink jet head herein may be of a structure comprising a combination of a plurality of ink jet heads or an integrated structure of a plurality of ink jet heads.
  • the filter according to the present invention be employed also in other portions than an ink supply path in an ink jet apparatus.
  • FIG. 1 is a schematic view for explaining an example of a process for producing a filter according to the present invention.
  • FIG. 2 is a schematic slant view illustrating the entire constitution of an ink jet cartridge having an ink jet head based on the present invention and an ink cartridge.
  • FIG. 3 is a schematic slant view illustrating a detailed constitution in the vicinity of an ink supply port of an ink jet head based on the present invention.
  • FIG. 4 is a schematic slant view illustrating an ink jet apparatus in which an ink jet cartridge based on the present invention is installed.
  • FIG. 5 is a schematic view for explaining an example of the process for producing an ink jet head based on the present invention, showing that a porous hardening resin resulted after shells of microbaloons having been removed serves as a filter.
  • FIG. 6 is a schematic view illustrating a situation a minute hollow bodies-containing hardening resin is poured into a common liquid chamber.
  • FIG. 7 is a schematic view for explaining another example of a process for producing an ink jet head according to the present invention.
  • the filter according to the present invention has filter meshes based on a number of pores formed by using a dispersion comprising a number of microcapsules (hereinafter referred to as microbaloons or microspheres) dispersed in a thermo- or photo-setting resin (that is, a binder resin), each of the microcapsules comprising a shell composed principally of a thermoplastic resin and a core component composed principally of a material having a property to expand and vaporize when heated at a temperature higher than room temperature are dispersed in a thermo- or photo-setting resin (that is, a binder resin). Description will be made of each of the microbaloons.
  • the microbaloon herein means one that its volume is expanded to form a minute hollow sphere therein.
  • the microbaloon has a property in that when the microbaloon is heated, the core component is foamed (or vaporized) and along with this, the shell is thoroughly expanded, and soon after a maximum volume having been attained for the microbaloon, when the heating treatment is terminated the environmental temperature is returned to room temperature, the resultant maximum volume is maintained as it is but when the heat treatment is still continued, the resultant volume is gradually reduced.
  • the microbaloon used in the present invention comprises a shell composed principally of a thermoplastic resin and a core composed principally of a material having a property to expand and vaporize when heated at a temperature which is higher than room temperature.
  • thermoplastic resin to constitute the shell are preferably those thermoplastic resins containing, as the main constituent, at least a component selected from the group consisting of polyvinyl chloride, polyvinylidene chloride, vinyl chloride-vinyl chloride copolymer, acrylonitrile-vinyl chloride copolymer and vinyl acetate-vinyl chloride copolymer.
  • the core it is required that the core is vaporized at a temperature which is slightly higher than room temperature while producing a gas which does not a negative influence to a hardening resin.
  • the core is desired to be composed of a component selected from the group consisting of isobutane and isobutylene.
  • Expansel 551DU (trademark name, produced by Expancel Company of Sweden) is the most desirable.
  • the filter according to the present invention comprises a porous resin hardened material produced by utilizing pores provided by microbaloons constituted as above described.
  • the filter according to the present invention is advantageous in that since the binder resin has an adhesion property, it is not necessary to use an adhesive upon disposing the filter, and because of this, the filter is free of occurrence of the problem relating to clogging which is found in the prior art.
  • welding or the like is not necessary to be conducted upon the installation and thus, the filter is free of any restriction in relation to the place where it is disposed or the form therefor.
  • the starting filter-forming material that is, the foregoing dispersion comprising the microbaloons and the binder resin
  • the filter according to the present invention is similar or superior to the known filter in terms of the functions required for a filter.
  • a hardening resin having a property to harden with the action of an activation energy (light or heat energy).
  • Such hardening resin can include thermosetting resins and photosetting resins. Specific examples are epoxy resin, acrylic resin, diglycol alkylcarbonate resin, unsaturated polyester resin, polyurethane resin, polimide resin, melamine resin, phenol resin, and urea resin.
  • epoxy resin particularly, ODER SY25 (trademark name, produced by Tokyo-Ohka Kabushiki Kaisha) is the most desirable as the thermosetting resin
  • acrylic resin particularly NITRON 8526 (trademark name, produced by Nittodenko Kabushiki Kaisha) is the most desirable.
  • the current resistance thereof is substantially governed by the pores provided by the microbaloons. That is, the fluid resistance of the filter can be properly controlled by adjusting the diameter of the pore (the minute hollow sphere) formed by each of the microbaloons and the content proportion of the microbaloons to the binder resin.
  • the control of the pore diameter herein can be conducted by a manner (1) in which the volume of each of microbaloons is made to be of a desired magnitude by properly controlling the temperature upon the heat treatment while utilizing the foregoing properties of the microcapsule or a manner (2) in which the diameter of the core of each of non-expanded microbaloons is adjusted as desired.
  • the binder resin (the thermosetting or photosetting resin) containing the above described microbaloons functions as a filter, pores formed by the microbaloons are necessary to be communicated with each other.
  • the shells (composed of the thermoplastic resin) of the microbaloons are necessary to be removed by resolving them in a solvent.
  • the solvent usable must be such a solvent that does not impart any negative influence to the binder resin after having been hardened and has a selective solubility to only the shells. Specific examples of such solvent are acetone and dimethylformamide (DMF).
  • DMF dimethylformamide
  • the content of the microbaloons is desired to be in the range of 20 to 90 wt.%.
  • the content of the microbaloons in the dispersion is less than the lower limit of said range, there is a tendency that the microbaloons are not sufficiently contacted with each other to result in providing a product which does not function as a filter.
  • the content of the microbaloons in the dispersion is beyond the upper limit of the above described range, there is a tendency of providing such a filter that is insufficient in strength and does not possess a desirable current resistance.
  • the heat treatment for the dispersion is desired to be conducted at a relatively high temperature.
  • the binder resin is likely to suffer from a certain negative influence.
  • a filter used in an ink jet head it is used chiefly for the purpose of preventing its discharging outlets from being clogged with foreign matters.
  • the discharging outlets of the ink jet head are usually of a size of 25 to 50 ⁇ m in diameter.
  • a basic requirement for the filter is to remove foreign matters having a size which is greater than the above size.
  • the foreign matters to be removed by the filter in an ink jet head there can be considered those having a size of 30 to 50 ⁇ m in diameter.
  • each pore (or each minute hollow sphere) formed by the microbaloons it is desired for each pore (or each minute hollow sphere) formed by the microbaloons to be of a size of 30 ⁇ m or less in diameter.
  • the filter according to the present invention is desired to be structured such that it functions to effectively remove foreign matters contained in ink, without reducing the size of each of the pores formed.
  • the filter it is desired for the filter to be designed to have a thickness corresponding to a value of 5 times or more over the diameter of a pore formed by one of the microbaloons in the direction in parallel to the ink supplying direction (or in the direction along the ink flow path when disposed therein).
  • FIG. 1(A) is a schematic cross-sectional view illustrating a layer composed of a dispersion comprised of microbaloons dispersed in a binder resin.
  • FIG. 1(B) is a schematic cross-sectional view illustrating a dispersion layer obtained by subjecting the dispersion layer shown in FIG. 1(A) to heat treatment wherein the core components of the microbaloons have been vaporized to expand the resin shells.
  • FIG. 1(C) is a schematic cross-sectional view illustrating a product obtained by subjecting the treated dispersion layer shown in FIG. 1(B) to etching treatment using a selectivity-bearing solvent wherein the resin shells have been dissolved to communicate pores based on the microbaloons with each other.
  • a number of microbaloons 52 are dispersed in a hardening resin 51 as a binder resin as shown in FIG. 1(A).
  • the dispersing operation herein is conducted by means of a conventional homogenizing means such as homogenizer or the like.
  • the microbaloons-containing hardening resin dispersion is subjected to heat treatment at a desired temperature, wherein each of the microbaloons is expanded to a desired magnitude.
  • a volatile core material 53 of each microbaloon is vaporized to expand the microbaloon as shown in FIG. 1(B).
  • microbaloons of Expancel 551DU (trademark name, produced by Expancel Company) are used as the microbaloons 52 and they are heated to 120 °C, the microbaloons originally of 7 ⁇ m in mean particle size are expanded to have a mean particle size of about 20 ⁇ m. Soon after this, when the thus expanded microbaloons are quickly returned to room temperature, thermoplastic resin shells 54 are cooled to harden, wherein the pores resulted are made to maintain their diameter upon the expansion.
  • the binder resin 51 in which the microbaloons in expanded state are contained is subjected to hardening treatment.
  • the binder resin when the hardening resin as the binder resin comprises a thermosetting resin, the binder resin is liable to harden upon expanding the microbaloons. Therefore, it is necessary to have a due care so that the binder resin is not hardened upon expanding the microbaloons and after the microbaloons having been expanded as desired, the binder resin is hardened.
  • the present inventors made experimental studies of the conditions that enable the binder resin to be hardened after expanding the microbaloons to be in a desired state, while paying attentions to the quantity of an energy that makes the microbaloons expanded as desired and also to the quantity of an energy that makes the binder resin hardened.
  • the binder resin comprising a thermosetting resin
  • the condition for it to be hardened is to apply a given amount of an energy thereto.
  • the diameter of each microbaloon expanded is governed by the maximum quantity of an energy applied.
  • the microbaloons can be expanded as desired prior to hardening the thermosetting resin.
  • the binder resin comprises a photosetting resin
  • the binder resin is not hardened by heat and thus, such heating treatment as described above is not necessary to be conducted.
  • the binder resin can be properly hardened by irradiating light thereto after conducting the step of expanding the microbaloons, wherein the microbaloons expanded can be readily controlled in terms of their diameter.
  • the resin shells of the microbaloons in hardened state after the completion of the hardening of the binder resin are resolved with a solvent such as acetone to form pores 55 based on the microbaloons, whereby the formation of a filter is completed. (see, FIG. 1(C)).
  • non-expanded microbaloons are dispersed in a binder resin.
  • the content of the microbaloons contained in the binder resin is raised, it is desired to disperse non-expanded microbaloons in the binder resin.
  • the dispersion used in the present invention which comprises the microbaloons dispersed in the binder resin is in a liquid state unless it is hardened. Thus, it can be applied to a desired place by means of a coating or injecting technique.
  • the step of forming the dispersion layer is conducted before the binder resin is hardened. Particularly, the step of heating the microbaloons may be conducted after or before the formation of the dispersion layer.
  • photosensitive resist ODER SY25 (trademark name, produced by Tokyo-ohka Kabushiki Kaisha) was firstly provided as the binder resin, to this binder resin, non-expanded microbaloons of Expancel 551DU (trademark name, produced by Expancel Company) were added in an amount of 50 wt.%, and the resultant was homogenized by means of a homogenizer, whereby a dispersion was obtained. Then, a glass substrate with a positive type resist layer having been hardened and solubilized was provided. On the surface of this glass substrate, the dispersion was applied by means of a screen printing technique to form a dispersion layer, followed by drying at 60 °C for 2 hours.
  • the dispersion layer having been dried was found to have a thickness of 100 u ⁇ 10 um and to be free of defects liable to occur due to addition of the 50 w% of microbaloons (such as layer removal upon the screen printing, undesirable thickness distribution, or stain upon the screen printing).
  • the above dispersion layer having been dried was heated to 120 °C, wherein the microbaloons in the dispersion layer started expanding at the initial stage and the layer became to have a thickness of 180 ⁇ m after the lapse of 3 minutes. By this, a number of pores of 60 um were formed in the dispersion layer. Thereafter, the dispersion layer was subjected to exposure, and the hardened resin shells of the microbaloons were then removed by dissolving them in acetone. Thus, there was obtained a filter having a porous structure.
  • thermosetting resist NOTRON T8526 (trademark name, produced by Nittodenko Kabushiki Kaisha) was used as the binder resin and no exposure was conducted, to thereby obtain a filter.
  • thermosetting resist NOTRON T8526 (trademark name, produced by Nittodenko Kabushiki Kaisha) was used as the binder resin and no exposure was conducted, to thereby obtain a filter.
  • the dispersion state of the microbaloons was observed by means of a metallographic microscope.
  • the observed result is shown in Table 1 on the basis of the following criteria: L for the case of rough dispersion, M for the case of suitable dispersion, and H for the case of dense dispersion.
  • the current resistance for a filter it is somewhat different depending on the diameter of a foreign matter to be removed, but in general, it is desired to be in the range of 10 to 100 mmAq.
  • the binder resin was hardened without the microbaloons having been expanded; particularly, the drying treatment was conducted at a temperature lower than the temperature at which the microbaloons would start expanding, and because of this, during the drying treatment, the thermosetting resin as the binder resin was hardened such that the microbaloons could not be expanded; hence, the formation of a filter structure of exhibiting a filter performance could not be conducted.
  • FIGs. 2 and 4 are schematic views illustrating an example of an ink jet head in which a filter according to the present invention can be applied and an example of an ink jet printer in which a filter according to the present invention can be applied, respectively.
  • IJH indicates an ink jet head of the system in which ink is discharged to a recording sheet using a bubble caused by thermal energy
  • IJC (11) indicates an ink jet cartridge which includes an ink jet head IJH (10) integrated with ink cartridges IC (12) for supplying ink to the IJH and which is detachable to an apparatus
  • IJA indicates an ink jet apparatus body.
  • the ink jet cartridge IJC in this embodiment is of a configuration in which a tip portion of the ink jet head IJH is projected a bit beyond the front face of the ink cartridge IC.
  • the ink jet cartridge IJC is fixed to a carriage HC mounted in an ink jet apparatus body IJA, but it is of a disposable type which is detachable to the carriage HC.
  • the ink cartridge IC (12) which stores ink to be supplied to the ink jet head IJH comprises an ink absorbent, a vessel for housing said ink absorbent and a covering member for sealing the vessel (not shown in the figure).
  • the ink cartridge IC (12) is charged with ink, and the ink contained therein is successively supplied to the ink jet head side in accordance with ink discharging.
  • the ink cartridge herein is for printing a color image and it comprises four different ink cartridges (12a, 12b, 12c and 12d) respectively corresponding to ink of each color of black (Bk), cyanogen (C), magenta (M) and yellow (Y). These ink cartridges separately supply given ink to a distributor DB (13) of the ink jet head through an ink supply pipe IP (14).
  • the distributor DB (13) is provided with four ink supply nozzles each connected to one of the foregoing ink cartridges IC-B (12a), IC-Y (12b), IC-M (12c) and IC-C (12d).
  • the ink cartridge system may comprise a system in which the three different color cartridges IC-Y, IC-C, and IC-M are integrated or other system in which they are separately arranged. These two systems may be selectively used depending as the need arises.
  • the ink cartridge is designed so that it can be detached by a user. Therefore, when ink in the ink cartridge is old, the ink cartridge can be replaced by new one. In this case, when a bubble should be occurred between the ink supply nozzle and the ink container, it is removed by a recovery mechanism disposed in the apparatus body IJA so as to prevent occurrence of defective printing.
  • the distributor DB 13
  • a filter for preventing flow-in of a foreign matter, which serves to protect the nozzle and ink supply pipe from being clogged by a foreign matter flown from the ink container.
  • a filter valve is disposed in the nozzle communicated with the ink cartridge IC-B in order that bubbles accumulated in the filter portion can be readily removed upon the recovery operation.
  • reference numeral 100 indicates a heater board prepared by the conventional film-forming technique, said heater board comprising a plurality of electrothermal converting bodies (or discharging elements) 102 arranged in row on a Si base member 303 and electric wires 101 made of Al or the like for supplying an electric power to said electrothermal converting bodies.
  • Reference numeral 200 indicates a wiring board for the heater board 100.
  • the wiring board 100 contains wirings corresponding to the wirings of the heater board 100 (the former wirings are connected to the latter wirings, for instance, by means of wire bonding 202) and pats 201 each situated at an end portion of each of the former wirings and which serve to receive electric signals from the apparatus body.
  • Reference numeral 300 indicates a top plate provided with concaved portions of providing a plurality of ink pathways and a common liquid chamber 302 for storing ink to be supplied to each ink pathway, a plurality of ink supply ports 301 respectively corresponding to each color ink and each for supplying the corresponding ink to the common liquid chamber, partition walls each for dividing ink supplied from each ink supply port in the common liquid chamber, and portions for forming a plurality of orifices 104 for discharging ink.
  • the top plate forms ink pathways between the ink supply ports 301 which receive ink from supplied from the ink cartridges IC and introduce the ink into the common liquid chamber 302 and the orifices 104.
  • the top plate having such concaved portions is comprised of, for example, a processed glass member.
  • the processed glass member herein may be, for example, borosilicate glass. However, the processed glass member may be of other glass. And instead of such processed glass member, molding resin materials can be used.
  • the top plate 300 is joined to the discharging element 100 with the use of an epoxy resin series adhesive.
  • This adhesive can include photosetting adhesives, adhesives capable of being hardened with light energy and thermal energy in combination, and thermosetting adhesives.
  • the bonding of the discharging element 100 is conducted with a silicon series or epoxy series adhesive.
  • a silicon series or epoxy series adhesive As the adhesive used herein, there is selectively used one which provides a desirable adhesion for the discharging element and possesses a good thermal conductivity so that a heat generated by the discharging element is dissipated.
  • the distributor DB is held by the base member (or the base plate) 400, wherein the distributor is desirably positioned by means of the three positioning holes while being heat welded.
  • the connection between the distributor DB and the discharging element 100 sealing is made between the ink supply unit and the ink supply ports 301 by means of a two-liquid sealing material. And the wire-bonded portion between the discharging element and the wiring board is also sealed using the sealing material.
  • the ink jet head IJH in this embodiment is fixed to a carriage HC and it is designed such that only the ink cartridge can be exchanged by new one when the ink therein is terminated. Hence, the ink jet head ensures to stably conduct high quality printing without causing a variation among prints obtained.
  • FIG. 4 is a schematic view illustrating the constitution of an ink jet head apparatus in which the present invention is applied.
  • a lead screw 5005 rotates by way of drive transmission gears 5011 and 5009 by the forward and backward rotation of a driving motor 5013.
  • the lead screw has a helical groove 5004 with which a pin (not shown) of a carriage HC is engaged, by which the carriage is reciprocable in a given direction.
  • Reference numeral 5002 indicates a sheet confining plate for confining a sheet on a platen 5000 over the carriage movement range.
  • Home position detecting means 5007 and 5008 are in the form of a photocoupler to detect the presence of a lever 5006 of the carriage, in response to which the rotational direction of of a motor 5013 is switched.
  • Reference numeral 5016 indicates a supporting member for supporting the front side surface of an ink jet head to a capping member 5022 for capping the ink jet head.
  • Reference numeral 5015 indicates sucking means which function to suck the ink jet head through an opening 5023 of the cap so as to recover the ink jet head.
  • Reference numeral 5017 indicates a cleaning blade which is moved toward front and rear by a moving member 5019. They are supported on a supporting flame 5018 of the main apparatus body. The blade may be in another form, specifically, a known cleaning blade.
  • Reference numeral 5012 indicates a lever which is effective to start the sucking recovery operation, and it is moved with the movement of a cam 5020 engaging the carriage.
  • the driving force from the driving motor is controlled by a conventional transmitting means such as clutch or the
  • the capping, cleaning and sucking operations can be performed when the carriage is at the home position by means of the lead screw.
  • the present invention is applicable also in any other ink jet heads wherein such operations are effected at different timing.
  • a first process comprises a step wherein a substrate having an electrothermal converting body containing energy generating elements is provided; a step wherein a top plate obtained by subjecting an appropriate member made of glass or a metal to cutting and etching treatments to form concaved portions for the formation of a discharging outlet, ink pathway and liquid chamber and to form an ink supply port for communicating a liquid chamber to the outside is provided; a step wherein the top plate is joined to the substrate using an adhesive while positioning the energy generating element and ink pathway as desired; and a step wherein an ink filter is adhered to the ink supply port, an ink supply unit is superposed and fixed to the ink supply port, and a sealing material is poured around the related ink communication path to fix the entire.
  • a second process comprises a step wherein a substrate having an electrothermal converting body containing energy generatingiatas is provided; a step wherein a top plate made of a resin which is provided with an ink discharging outlet, ink pathway and liquid chamber having been integrally formed by an injection molding process is provided; a step wherein the top plate is press-fixed to the substrate so as to establish a clearance, for instance, using a spring, while positioning the energy generating element and ink pathway as desired; a step wherein an ink supply unit having a cantilever structure provided with an ink filter adhered to the joint with an ink container is contacted to an ink supply port having been formed at the top plate upon conducting the above injection molding process; and a step wherein not only the clearance between the substrate and the top plate but also the press-contacted portion between the ink supply unit and ink supply port are respectively sealed using a different sealing material.
  • the third process comprises a step wherein a base member provided with an electrothermal converting body containing energy generating elements is provided, a photosensitive dry film of the positive or negative type is laminated over said base member, the resultant is subjected to light exposure while masking a pattern for forming an ink discharging outlet, ink pathway, and liquid chamber to the photosensitive dry film, followed by development to thereby form a solid layer having patterned portions corresponding to the discharging outlet, ink pathway and liquid chamber on the base member; a step wherein an activation energy ray-setting material capable of being hardened by an activation energy ray is applied over the solid layer and the base member at a given thickness, and a top plate made of an activation energy transmissive material, which is provided with a concaved portion for forming a part of the liquid chamber and a ink supply port, is superposed and adhered on the activation energy ray-setting material applied while positioning the concaved portion to a liquid chamber-forming portion whereby obtaining a
  • the present inventors found a process for producing an ink jet head using a filter according to the present invention.
  • the process for the production of an ink jet head according to the present invention comprises the steps of:
  • the preparation of the above substrate may be conducted by forming the foregoing electrothermal converting body on a base member by way of a conventional film-forming technique generally used in the semiconductor field. Thereafter, the solid layer composed of a removable material is formed in a given area where an ink discharging outlet, ink pathway, liquid chamber and ink supply port are to be formed on the substrate.
  • the solid layer herein may be formed at a good precision by means of photolithography using a positive type photosensitive resist.
  • a hardening resin is applied so as to cover the substrate and the solid layer formed on the substrate. It is possible to join a top plate having a liquid chamber and ink supply port formed therein to the resultant substrate having the covering material laminated thereon.
  • the removable solid layer of the stacked body obtained in the above is treated with an appropriate solvent whereby the solid layer is removed.
  • an ink discharging outlet, ink pathway, liquid chamber and ink supply port is formed.
  • a filter is formed by forming a layer composed of a dispersion comprising a number of minute hollow spheres (microbaloons) each encapsulated by a shell made of a solvent soluble resin dispersed in an activation energy ray-setting resin (a thermosetting or photosetting resin), hardening the activation energy ray-setting resin (or the thermosetting or photosetting resin), and subjecting the dispersion layer thus treated to treatment with the use of a solvent having a selective solubility only to the shell of each of the microbaloons to remove the shell of each of the microbaloons, whereby pores based on the microbaloons are communicated with each other thereby forming a filter.
  • an activation energy ray-setting resin a thermosetting or photosetting resin
  • the step of disposing the microbaloons-containing hardening resin dispersion layer is preferred to be conducted after the formation of the liquid chamber. However, it may be conducted at anytime after the formation of the solid layer and before the removal of the solid layer.
  • the step of removing the shells of the microbaloons may be conducted simultaneously with the removal of the solid layer.
  • microbaloons-containing hardening resin dispersion there may be employed a manner wherein the hardening resin dispersion is injected into the liquid chamber, followed by heat treatment, whereby pores based on the microbaloons are formed or a manner wherein microbaloons are provided, the microbaloons are subjected to heat treatment to expand each of them, the resultant expanded microbaloons are dispersed into a binder resin to obtain a microbaloons-containing hardening resin dispersion, and the microbaloons-containing hardening resin dispersion is injected into the liquid chamber, followed by heat treatment, whereby pores based on the microbaloons are formed.
  • microbaloons-containing hardening resin dispersion may be conducted by means of the conventional screen printing or transfer printing technique, or the conventional dispenser injection technique. These application techniques may be selectively employed depending upon the kind of the microbaloon used and the manner of expanding the microballon.
  • the layer of the microbaloons-containing hardening resin dispersion is disposed in the common liquid chamber.
  • it may be disposed in a space portion of the common liquid chamber as a member which is different from other constituent elements.
  • the substrate is desired to be provided with an element for generating ink discharging energy.
  • the ink discharging energy-generating element is desired to be an electrothermal converting body.
  • the ink jet head constituted as above described is mounted in an ink jet apparatus, it makes the ink jet apparatus to exhibit a printing performance superior to that in the prior art.
  • FIG. 5 is a schematic view illustrating a state of a dispersion for the formation of a filter which is injected in a common liquid chamber, said dispersion comprising a number of microbaloons dispersed in a binder resin.
  • FIG. 6 is a schematic view illustrating a state of the binder resin having a porous structure formed after the resin shells of the microbaloons having been removed which functions as a filter.
  • reference numeral 1 indicates an electrothermal converting element
  • reference 2 a base member
  • reference numeral 3 a discharging outlet (or an orifice)
  • reference numeral 4 an ink pathway
  • reference numeral 5 a dispersion layer
  • reference numeral 6 an ink supply port
  • reference numeral 7 a resist
  • reference numeral 8 a second base member
  • reference numeral 9 a common liquid chamber.
  • a silicon base member having electrothermal converting bodies (comprised of HfB2) formed thereon, there was formed a 50 ⁇ m thick photosensitive layer by laminating a positive type dry film OZATEC R225 (trademark name, produced by Hoechst Japan Kabushiki Kaisha) thereon.
  • the photosensitive layer was subjected to irradiation of ultraviolet rays while shielding a given portion thereof for forming ink pathways, followed by subjecting the resultant to spray development using a 1% aqueous solution of caustic soda. Thereafter, a solid layer (of 50 ⁇ m in thickness) was formed in a liquid flow path-forming area including the electrothermal converting bodies on the silicon base member.
  • Araldite CY230/HY956 (trademark name, produced by Chiba Geigy Company) as an epoxy resin was applied onto the substrate having the solid layer thereon by means of a conventional applicator, followed by allowing to stand at 30 °C for 12 hours, whereby the hardening resin on the substrate was completely hardened.
  • a glass member as a top plate having a concaved portion in a liquid chamber-forming area and a throughhole (ink supply port 6) at the center of the concaved portion was joined while positioning the location of the liquid chamber-forming area as desired.
  • a dispersion for the formation of a filter according to the present invention comprising a number of microbaloons dispersed in a binder resin was applied onto the solid layer through the ink supply ports 6 by means of a conventional dispenser.
  • a dispersion obtained by adding 50 wt.% of Expancel 551DE-20 microbaloons (trademark name, produced by Expancel Company) to ODER SY25 (trademark name, produced by Tokyo Ohka Kabushiki Kaisha) as a photosensitive hardening resin to obtain a mixture and homogenizing the mixture.
  • the amount of the microbaloons it was made to be 50 wt.% here, but it can be made to be in the range of 20 to 90 wt.%.
  • the assembly comprising the substrate and top plate was subjected to irradiation of ultraviolet rays, whereby the solid layer was solubilized.
  • the resultant was immersed in an aqueous NaOH solution in an ultrasonic washing vessel for about 10 minutes, whereby the solubilized solid layer was removed by resolving it in the solvent.
  • the resultant obtained was washed with pure water, followed by drying. Thus, the formation of an ink jet head was completed.
  • the filter formed was found to have a fluid resistance in the range of 10 to 100 mmAq, wherein a good correlation was attained in relation to the flow amount of ink.
  • FIG. 7 is a schematic view for explaining a process for producing an ink jet head in this example.
  • reference numeral 2 indicates a base member
  • reference numeral 5 a dispersion for the formation of a filter, comprising a number of microbaloons dispersed in a binder resin
  • reference numeral 7 a resist a solid layer
  • Example 1 the microbaloons having been expanded were dispersed in the resist and the resultant was injected into the common liquid chamber.
  • the procedures of Example 1 were repeated. That is, there was obtained a dispersion for the formation of a filter in the same manner as in Example 1, except for using non-expanded Expancel 551DU microbaloons.
  • the dispersion obtained was applied onto a resist pattern by a conventional screen printing technique, followed by drying at 60 °C for 2 hours.
  • the dispersion layer having been dried was found to have a thickness of 100 u ⁇ 10 um, wherein no any defect (such as film removal, a variation in the film thickness, print bleeding and the like upon the screen printing) was not observed.
  • the dried dispersion layer Prior to joining the top plate to the substrate, the dried dispersion layer was subjected to heat treatment at 120 °C, wherein the microbaloons being dispersed in the binder resin started expanding and after the laps of 3 minutes, the layer thickness become 180 um. By this, a number of hollow spheres having a diameter of 60 ⁇ m in mean value were formed. Then the top plate was joined to the substrate. After this, the resin shells of the expanded microbaloons were etched with a solvent to form a number of pores communicated with each other. Thus, there was formed a filter. In this example, the non-expanded microbaloons in the dispersion layer were of 7 ⁇ m in volume average particle size arid the expanded microbaloons were of about 20 um in volume average particle size.
  • the filter can be integrally formed even in a complicated portion of an ink jet head and the filter formed can be made to have a relatively large area without necessity of fixing the filter by conducting a particular treatment or step. Further, according to the present invention, there can be attained a reduction in the expenses for the assembling process, a reduction in the load for the process control, and an improvement in the yield.
  • the present invention makes it possible to provide a highly reliable ink jet head capable of conducting high speed printing at a reduced production cost.
  • the present invention provides prominent effects in an ink jet head or an ink jet apparatus, especially of the system in which a thermal energy generating means (for example, an electrothermal converting body or laser beam) for generating a thermal energy as the energy utilized for discharging ink is installed and a state change is caused for the ink by virtue of the thermal energy. According to such system, there can be attained dencification and high definition.
  • a thermal energy generating means for example, an electrothermal converting body or laser beam
  • the printing liquid (ink) is discharged through a discharging outlet to form at least one droplet. It is more desirable to make the driving signal to be of a pulse shape, since in this case, growth and contraction of a bubble take place instantly and because of this, there can be attained discharging of the printing liquid (ink) excelling particularly in responsibility.
  • driving signal of pulse shape such driving signal as disclosed in U.S. Pat. No. 4,463,359 or U.S. Pat. No. 4,345,262 is suitable. Additionally, in the case where those conditions disclosed in U.S. Pat. No. 4,313,124, which relates to the invention concerning the rate of temperature rise at the heat acting face, are adopted, further improved printing can be conducted.
  • the present invention includes, other than those constitutions of the discharging outlets, liquid pathways and electrothermal converting elements in combination (linear liquid flow pathway or perpendicular liquid flow pathway) which are disclosed in the above mentioned patent documents, the constitutions using such constitution in which a heat acting portion is disposed in a curved region as disclosed in U.S. Pat. No. 4,558,333 or U.S. Pat. No. 4,459,600.
  • the present invention may effectively take a constitution based on the constitution in which a slit common to a plurality of electrothermal converting elements is used as a discharging portion of the electrothermal converting elements, which is disclosed in Japanese Unexamined Patent Publication No.
  • the present invention is effective in the case of a full-line type ink jet head having a length corresponding to the maximum width of a printing medium on which printing can be performed.
  • This full-line type ink jet head may be of such constitution in which a plurality of ink jet heads are combined so as to satisfy the length desired or such constitution in which they are integrated into a full-line head.
  • the present invention is effective also in the case of such serial type as above described, or in the case of an ink jet head of the exchangeable chip type wherein electric connection to an apparatus body or supply of ink from the apparatus body is enabled when it is mounted on the apparatus body, or in the case of another ink jet head of the cartridge type wherein an ink tank is integrally disposed on the ink jet head itself.
  • discharge recovery means or appropriate preparatory auxiliary means to an ink jet apparatus according to the present invention in view of further stabilizing the ink jet apparatus.
  • capping means for the ink jet head cleaning means therefor, pressing or sucking means, preliminary heating means by the electrothermal converting means or by a combination of the electrothermal converting body and additional heating element and means for preliminary discharging not for the printing operation.
  • the ink jet heads mountable it may be a single corresponding to a single color, or may be plural corresponding to a plurality of inks having different recording colors or densities.
  • the present invention is effectively applicable to an ink jet apparatus having at least one of a monochromatic mode mainly with black and a multi-color with different colors and a full-color mode by the mixture of the colors which may be an integrally formed unit or a combination of a plurality of ink jet heads.
  • inks having a property of being liquefied, for the first time with thermal energy, such that such ink can be liquefied and discharged in the liquid state upon the application of thermal energy depending upon a printing signal or other ink that can start its solidification beforehand at the time of its arrival at a printing member in order to prevent the temperature of the ink jet head from raising due to thermal energy purposely used as the energy for a state change of ink from solid state to liquid state or in order to prevent ink from being vaporized by solidifying the ink in a state of being allowed to stand.
  • these inks they can be used in such a manner as disclosed in Japanese Unexamined Patent Publication No.
  • the ink jet apparatus may be appropriately configured such that it can be used as image outputting terminals in information processing devices such as computers or as copying devices which are combined with readers. Other than this, it can be configured to have a configuration as a facsimile device having a transmit-receive function.
  • the filter according to the present invention has been directed to its use in an ink jet apparatus.
  • the use of the filter according to the present invention is not limited only to this but the filter is also usable in other fields, wherein it sufficiently exhibits its effects.
EP94919883A 1993-07-09 1994-07-11 Harzfilter für einen tintenstrahldruckkopf und verfahren zu deren herstellung Expired - Lifetime EP0664217B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP17009993 1993-07-09
JP17009993 1993-07-09
JP170099/93 1993-07-09
PCT/JP1994/001128 WO1995001878A1 (fr) 1993-07-09 1994-07-11 Filtre en resine pour tete d'impression a jet d'encre et procede de fabrication

Publications (3)

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EP0664217A1 true EP0664217A1 (de) 1995-07-26
EP0664217A4 EP0664217A4 (de) 1996-07-03
EP0664217B1 EP0664217B1 (de) 2001-11-07

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EP (1) EP0664217B1 (de)
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Also Published As

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DE69428975D1 (de) 2001-12-13
EP0664217A4 (de) 1996-07-03
WO1995001878A1 (fr) 1995-01-19
US5662844A (en) 1997-09-02
EP0664217B1 (de) 2001-11-07
DE69428975T2 (de) 2002-06-06

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